Paedon aemingtolst



(No Model.)

P. ARMINGTON.

YALVE FOR STEAM ENGINES. No. 357,113. Patented Feb. 1, 1887.

WI TNI 551E 51 UNITED STATES PATENT OFFICE. 1

PARDON'ARMINGTON, OF FROVIDENGE, RHODE ISLAND.

VALVE FOR STEAM-ENGINES.

EPIBCIFICATION forming part of Letters Patent No. 357,113. dated February 1, 1887.

Application filed August 21, 1885. Serial No. 174,937. (No model.) 7

To aZZ whom it'vnay concern.-

Be it known that I, PARDON ARMINGTON, of the city and county of Providence, and State of Rhode Island, have invented a new and useful Improvement in Valves for Steam-Engines; and I hereby declare that the following is a full, clear, and exact description of the same, reference being had tothe accompanying drawings, forming part of this specification.

This invention has reference to an improvement in the construction of the valve of a steamengine by which the admission andthe exhaust of the steam is regulated; and it consists in'the peculiar and novel construction of the valveand valve-chamber, as will be more fully set forth hereinafter.

The efficiency of a steam -'engine depends largely on the facility with which the steam is supplied to and exhausted from the cylinder. When the piston has reached either end of its reciprocation, steam must be supplied as quickly and in as large quantity as possible, to exert force and move it in the opposite direction.

The object of this invention is to increase the number of the steam'inlets to the valve, soas to allow a larger quantity of steam to enter the cylinder at the first opening ofthe steam-ports,and also to facilitate the boring, fitting, and renewing ofthe valve-cylinder.

Figure 1 is asectional view of the steam-cylinder and steam-chest at right angle to the axis of the cylinder. Fig. 2 is a longitudinal sectional view of the steam-cylinder, the steamchest, and valve. Fig. 3 is a sectional view of the bushing in which the valve slides, taken through the port-opening. Fig. 4c is a sectional view ofthc valve through the port or inlet.

In the drawings, A is the engine-cylinder, in which the piston B reciprocates.

G is the steam-chest, from which the live steam is supplied to the cylinder.

D D are the exhaustports.

E Eare the ports connecting with the ends of the engine-cylinder, by which the steam is alternately admittedto and exhausted from the cylinder.

F is the tubular stem or steam-valve, and G G are the closed ends of the steam-valve, by which the exhaust-ports are opened and closed.

h h are the steam-ports, located on the ends of the tubular valve, by which the live steam from the steam-chest is admitted to one end of the engine-cylinder from both ends of the valve simultaneously. This construction is the subject-matter of a prior application for a patent, which was filed by me January 2, 1883.

i t are the additional steam-ports connecting with the tubular valve, by which, on the first opening of the valve, an increased quantity of steam is permitted to enter the engine-cylinder through the tubular valve, which forms part of the present invention.

In place of the two auxiliary steam-ports 11 i, four or more of such auxiliary ports may be used to increase the supply of steam at the first opening of the valve; and as these ports supply steam through the tubular valve to both ends of the engine-cylinder, it is evident that one such auxiliary port will materially .70 increase the quantity of steam supplied. By thus increasing the number of the inlet-ports the steam is not only supplied to the piston of the engine-cylinder more promptly, but the steam-supply can be cutoff more quickly,with ,7 5 less motion of the valve, and the benefits of the expansion of steam are more fullysecured.

The auxiliary steam-ports t t slide in short sections or ring-like bodies I I, forming the inner ends or parts of the internal cylinders or sleeves, K, to which they are connected by means of the ribs 1" i, so as to give freeaccess to the auxiliary ports, as shown in Fig. 3. The auxiliary ports consist of a hollow piston or casing having a circumferential slit, so as to form a large inlet area, the two parts of the piston being connected by the ribs 4? i as shown in Fig. 4, so as to form one casting.

The internal cylinder, in which the steamvalve reciprocates, has heretofore been formed 0 in one piece with the stean1-chest,and usually cast in one casting with the engine-cylinder, which was bored out and finished to receive the steamwalve. With the greatest care such castings are alwayslmore or less imperfect, the 5 accurate boring and finishing of the valve-cyliuder required the handling of the large mass of metal. To remedy this defect, permit the use of metal especially adapted to the sliding of the valve with the least friction and wear, rco

valve and the heat from the steam.

and also to provide the rings or short sections of cylinders for the auxiliary valve or valves, I construct the internal or valve cylinders separately and secure the same in the steamchest, as is shown in Fig. 2.

K is a sleeve or bushing provided with a flange by which it is secured with bolts to the casting of the steam-chest. This sleeveisprovided with the ribs 2" i, tapering from the outer edge of the flange to the ring or rings I. The portion of the sleeve K which enters the casting surrounding the ports E is made slightly tapering, and the casting is bored out so as to fit the sleeve. The interior of the internal cylinder or sleeve, K, is turned and finished, by grinding or otherwise, to fit the valve accurately. It may be made of any metal best suited to withstand the wear of the Thesleeve can be readily put in position through the chest-cover L. As it is slightly tapering it will easily enter the bore until the flange bears against the face, when it is readily secured by bolts, and when any repairs are required it can be as readily removed.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. The combination of a hollow valve stem or body provided withlateral openings or ports at one or more points therein, a chambered casing fixed upon said stem and about said ports and provided with side openings or ports, and the internal or valve cylinders fixed within the steam-chest and communicating with the steam and exhaust ports, said cylinders having openings into the steam-chest, said casings sliding in said cylinders and across said openings therein, whereby the live steam may pass from the steam-chest through the easings into the interior of the valve-stem.

2. The combination of a tubular valve-stem closed at the ends, circumferentialopenings at two or more points near each end in said stem,

a chambered casing provided with an annular port and fixed on said stem and about each opening therein,and an internal valve-cylinder for each end of said stem and fixed within the steam-chest, said cylinder communicating with thesteam and exhaust ports and provided with circumferential openings letting into'the steamchest, the casings on the stem sliding in said cylinders and over said openings therein, substantially as and for the purpose described.

3. The combination, with ports E E of a steam-engine and the steam-ports h h, of one or more auxiliary ports, 1', communicating with the tubular stem of the steam-valve, and one or more valve-cylinders, as described.

4. The combination, with the ports of a steam-engine and the tubular valve F, provided at each end with the ports h h and with one or more auxiliary ports communicating with the tubular valve, of the ring or rings I, forming the cylinder for the auxiliary port or ports, as described.

5. The combination, with the tubular valve F, provided with the auxiliary ports 2' i, of the internal cylinder, K, and the section I, secured within the valvechest and constructed to form the cylinder for the valve, as described.

6. The combination, with the ports E, of the internal cylinder, K, made slightly tapering and provided with a flange and having the sec tion I, both constructed to form the cylinder for the valve, as described.

7. The combination, with the steam-chest and the steam and exhaust ports, of the valveeylinders K, provided with the sections I and mounted within the steam-chest, the hollow valvestem F, having closed ends and provided with the ports h, and the auxiliary ports 3, substantially as described.

PARDON ARMINGTON.

Witnesses:

J. A. MILLER, Jr., M. F. BLIGH. 

